Ore-rake



- (No Model.)

r J. C. BLAIR.

ORE RAKE.

Patented Dec. 6, 1892.

1 I E llllllll UNITED STATES PATENT nmen.

JOHN CTBLAIR, OF VVILMINGTON, DELAXVARE.

ORE-RAKE.

SPECIFICATION forming part of Letters Patent No. 487,51 1, dated December 6, 1892.

Application filed May 14, l892. Serial No. &33,395. (No model.)

To all whom it may concern:

Beit known that I, JOHN C. BLAIR, a citizen of the United States, residing at Wilmington, in the county of New Castle and State of Dela- Ware, have invented certain new and useful Improvements in Ore-Rakes; and I do hereby declare the following to be a full, clear, and eX- act description of the inventiongsuch as will enable others skilled in the art to which it appertains to make and use the same.

This invention is an improvement in rakes and rake-heads such as are used in furnaces for roasting ores, in which series of beds arranged one above the other communicate by means of alternate passages or openings at the end of the beds. Rakes of this kindare de signed for the purpose not only ot' sti'ring the pulverized ore upon the beds, so that it will burn easily and thoroughly thereon, but it is essential that the ore shall be propelled along :Elle bed by some positive means in one direclOIl. v

Heretofore rakes have been made which consisted merely of teeth having a triangular section,the front of the teeth pointing in the direction in which the rake is designed. to plow through the ore and therear or fiat sides of the teeth being toward that side of the furnace-bed toward which it is desired to push the ore, It has been found by a long course of experiments that this does not so effectually and positively move the ore in one direction as is necessary in burning some ores, such as iron pyrites, and therefore it has been the object of this invention to provide a more sure and certain means for pushing the ore positively in either direction.

With this object in view the invention resides in the various novel details of Construction and in the combination of parts hereinafter fully described, and particularly pointed out in the claims.

In the drawings in which I have illustrated my invention, and in which like letters of reference indicate corresponding parts, Figure l is a longitudinal Vertical section through a furnace in which my improved rake is used, showing the rakes in their proper position relative to the furnace and to each other. Fig. 2 is a perspective View showing in detail the rake and scraper as seen from the under side. Fig. 3 is a cross-section of the rake, showing the position of the scraper during a forward movement. Fig. 4 is a detail cross-section showing a guide c' resting on rail c In the drawings the letter Adesignates the furnace proper, and the letters aindicate the beds arrangcd in series one 'above the other therein. Each one ot the beds is provided with an opening a', and these openings are so arranged as to be in the alternate ends of each adjoining bed. A feeding-hopper'a is provided' near the top of the furnace, and a receptacle & is provided at the bottom thereof.

The raking mechanism proper consists of the usual carriage B, the rods B' extendiug from the carriage through openings in the furnace to the rahe-heads and the power or driving mechanism B The rake-head, which is designated by the letter C, is construeted as follows: To pieces ot' angle-iron C' are secured the teeth c, which in cross-section are triangular, or the body of the rake and the teeth may be cast integral. On either side of the head I provide depend ing sliding surfaces'c', which are designed to nove upon tracks or rails 0 which are provided within the furnace for the rahe-head to move upon. The sliding surfaces c' have guards 0 to retain them upon the rails. Across the top of the rake-head I secure two bars 0 and these bars, projecting beyond one end of the rahe-head, are provided with depending brackets 0 in which is pivotally hung the scraper or shovel D. These brackets' 0 are provided with loose bearings 0 wherein the scraper D may turn upon its pivotal points and with lugs or stops 0 at the bottom and c at the top to prevent the shovel D from turning more than a quadrant in any one movement. The shovel D consists only of a piece of metal having a flat outer side, a flat inner side rounded or curved near the bottom, trunnions at the top, (marked (1,) and cntaway portions below these trunnions, leaving arms or projeetions d', which impinge against the stops c 0 The shovel D is always hung upon that side of the rake, whether it be the inner or the outer side in reference to the rods B', toward which it is desired to push the ore. In the drawings it will be seen that the shovel which works upon the upper bed is hung upon the inner side of the mke-head, having regard to the rods B', and the shovel upon the ICO rahe-head working upon the second bed is hung upon the outer side of the rahe-head, and so on, alternately from bed to bed.

From the foregoing description it Will be obvious that in moving the rakes backward and forward through the pulverized ore the combined rake and shovel Will, in what may be called its forward movement, Curry or eomb the ore, thus gently turning the particlesand presenting them for combustion,while by a reverse motion the shovel restiug against the stops c will push the ore toward the opening a'. In the forward motiou the shovel is raised by the ore itself toany height less than or equal to that allowed by the stop 6 It will be observed that the shovel hangs a little higher than the bottom of the rahe-teeth, thus leaving a space between its lower edge and the bed over which it works. Therefore it will be apparent that it Will take several movements of the rahe-head baekward and forward completely to change the ore upon any one bed, as only asmall portion relatively is moved at one time.

It is of course to be understood that while i I have described my rahe-head as noviug upon sliding surfaees over traeks or ways provided upon the bed of the furnace I may,

Without departing from the spirit of my invention, enploy wheels or rollers in place of the sliding surfaces.

Having thus fully described my invention, What I claim as new, and desire to secure by Letters Patent of the United States, is-

l. The combination, in a reciprocating orestirrer, of a rahe-head carrying triangular teeth having their points all in one direction and their fiat rear surfaees in parallel planes, with a shovel or scraper pivoted to the rakehead iu a plane parallel to the flat surfaoes of the rahe-teeth and on the side of the teeth nearest to said flat surfaces, substantially as and for the purpose set fOl'th.

2. The'combination, in a reciprocating orestirrer, of a rahe-head having projeeting from one side of it the bars 0 having depending braokets 0 with the shovel or scraper D pivoted 'n these braekets and limited in its motion by means ot' lugs thereon, all substantially as and for the purpose set forth.

In testimony whereof I affix my signature in p presence of two witnesses.

JOHN C. BLAIR.

Witnesses:

J. ALTHEUs JoHNsoN, J ACOB P. KRASLET. 

